}
		})
	}
}

func TestInstantiateNonEquality(t *testing.T) {
	const src = "package p; type T[P any] int"
	pkg1 := mustTypecheck(src, nil, nil)
	pkg2 := mustTypecheck(src, nil, nil)
	// We consider T1 and T2 to be distinct types, so their instances should not
	// be deduplicated by the context.
	T1 := pkg1.Scope().Lookup("T").Type().(*Named)

			}
		})
	}
}

func TestInstantiateNonEquality(t *testing.T) {
	const src = "package p; type T[P any] int"
	pkg1 := mustTypecheck(src, nil, nil)
	pkg2 := mustTypecheck(src, nil, nil)
	// We consider T1 and T2 to be distinct types, so their instances should not
	// be deduplicated by the context.
	T1 := pkg1.Scope().Lookup("T").Type().(*Named)

	const bsrc = `package b; import "a"; type T struct { F interface { a.I } }; var _ = a.T(T{})`

	a := mustTypecheck(asrc, nil, nil)

	conf := Config{Importer: importHelper{pkg: a}}
	mustTypecheck(bsrc, &conf, nil)
}

type importHelper struct {
	pkg      *Package
	fallback Importer
}

func (h importHelper) Import(path string) (*Package, error) {

	return findStructTypeConfig(t, src, &types.Config{})
}

func findStructTypeConfig(t *testing.T, src string, conf *types.Config) *types.Struct {
	types_ := make(map[ast.Expr]types.TypeAndValue)
	mustTypecheck(src, nil, &types.Info{Types: types_})
	for _, tv := range types_ {
		if ts, ok := tv.Type.(*types.Struct); ok {
			return ts
		}
	}
	t.Fatalf("failed to find a struct type in src:\n%s\n", src)
	return nil
}

	return findStructTypeConfig(t, src, &types2.Config{})
}

func findStructTypeConfig(t *testing.T, src string, conf *types2.Config) *types2.Struct {
	types := make(map[syntax.Expr]types2.TypeAndValue)
	mustTypecheck(src, nil, &types2.Info{Types: types})
	for _, tv := range types {
		if ts, ok := tv.Type.(*types2.Struct); ok {
			return ts
		}
	}
	t.Fatalf("failed to find a struct type in src:\n%s\n", src)
	return nil
}

	P int
}

func (T) M(int) {}
func (T) N() (i int) { return }

type G[P any] struct {
	F P
}

func (G[P]) M(P) {}
func (G[P]) N() (p P) { return }

type Inst = G[int]
	`
	pkg := mustTypecheck(src, nil, nil)

	var (
		T        = pkg.Scope().Lookup("T").Type()
		G        = pkg.Scope().Lookup("G").Type()
		SrcInst  = pkg.Scope().Lookup("Inst").Type()
		UserInst = mustInstantiate(b, G, Typ[Int])
	)

	const bsrc = `package b; import "a"; type T struct { F interface { a.I } }; var _ = a.T(T{})`

	a := mustTypecheck(asrc, nil, nil)

	conf := Config{Importer: importHelper{pkg: a}}
	mustTypecheck(bsrc, &conf, nil)
}

type importHelper struct {
	pkg      *Package
	fallback Importer
}

func (h importHelper) Import(path string) (*Package, error) {

		if got := typ.String(); got != test.str {
			t.Errorf("%s: got %s, want %s", test.src, got, test.str)
		}
	}
}

func TestQualifiedTypeString(t *testing.T) {
	p := mustTypecheck("package p; type T int", nil, nil)
	q := mustTypecheck("package q", nil, nil)

	pT := p.Scope().Lookup("T").Type()
	for _, test := range []struct {
		typ  Type
		this *Package
		want string
	}{
		{nil, nil, "<nil>"},

	P int
}

func (T) M(int) {}
func (T) N() (i int) { return }

type G[P any] struct {
	F P
}

func (G[P]) M(P) {}
func (G[P]) N() (p P) { return }

type Inst = G[int]
	`
	pkg := mustTypecheck(src, nil, nil)

	var (
		T        = pkg.Scope().Lookup("T").Type()
		G        = pkg.Scope().Lookup("G").Type()
		SrcInst  = pkg.Scope().Lookup("Inst").Type()
		UserInst = mustInstantiate(b, G, Typ[Int])
	)

		if got := typ.String(); got != test.str {
			t.Errorf("%s: got %s, want %s", test.src, got, test.str)
		}
	}
}

func TestQualifiedTypeString(t *testing.T) {
	p := mustTypecheck("package p; type T int", nil, nil)
	q := mustTypecheck("package q", nil, nil)

	pT := p.Scope().Lookup("T").Type()
	for _, test := range []struct {
		typ  Type
		this *Package
		want string
	}{
		{nil, nil, "<nil>"},